a sequence of zero or more characters between an opening < and a closing > that contains no line endings or unescaped < or > characters, or
a nonempty sequence of characters that does not start with <, does not include ASCII control characters or space character, and includes parentheses only if (a) they are backslash-escaped or (b) they are part of a balanced pair of unescaped parentheses. (Implementations may impose limits on parentheses nesting to avoid performance issues, but at least three levels of nesting should be supported.)
A link destination consists of either:
Example:
[Test](<http://localhost:8000/>)Test